Speaking for TV Pink, he said Serbia had requested to be notified in writing so that there were no complaints that "Serbia is making things up."

Currently, there are less than 2,000 migrants in Serbia and only 36 refugees have requested asylum in the past few days.

Stefanovic said the refugees were not headed for Macedonia, Serbia or Croatia, but Western European countries. "Those who previously requested asylum did so to stay a few days and rest, so that they could continue," he said, adding that "by doing so, they are just buying time."

He announced that police directors of Greece, the countries on the Balkan route, Germany, the Netherlands and "everyone important in that process" would meet in Belgrade on Tuesday.

The key question is whether Western European countries want to receive migrants and refugees, he said. "If they do, that's the answer we must get," he said, adding that the migrant crisis had worsened in recent months. "European countries have different views, from those who don't want to see even one migrant on their territory, to those who have borne the biggest brunt."

Stefanovic said the president's approval to put the army on full alert if necessary was a precaution, in which case some troops would be deployed to protect citizens and the borders from illegal crossings. That's not necessary yet, but "we can't wait, for example, for the Greek-Macedonian border to be broken through and for dozens of thousands of people rushing into Serbia," he said.

Beirut (dpa) - Syrian government forces and their allies advanced deeper into the shrinking rebel-held enclave in eastern Aleppo on Wednesday, seizing the Old City, while demanding the armed opposition groups leave the area.